Hello!

On Tue, Feb 08, 2011 at 09:46:55AM -0500, HajoLOcke wrote:

> > nginx doesn't attempt authentication against SMTP backends. You
> > have to allow unauthenticated access from nginx on your SMTP
> > backends.
>
> ok, i thinking about this...
> but there must be a error in my response from auth-server, because not
> postfix is rejecting mail but nginx is with internal error message.
> postfix only says:
> lost connection after XCLIENT from localhost[127.0.0.1]
> what could be wrong? is there an additional header-line required?

It's Postfix who refused to talk to nginx, note "upstream sent
invalid response: "550 5.7.0 Error: insufficient authorization""
in your nginx log.

As you don't have proxy_pass_error_message in your config - this
results in "451 4.3.2 Internal server error" returned by nginx.

Maxim Dounin

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